But what if you accidentally create your resource mailbox as a user, instead? You can’t set it to auto-accept invitations, creating a management nightmare as each one has to be manually accepted on your resource’s calendar.

You can change the type of the account, but no one — Microsoft included — makes it easy to find out how! Here’s my humble effort to change that…

Well, that won’t do — we want AutoAccept, not AutoUpdate; the latter puts meeting invites in the “Tentative” state, while the former actually accepts them, which is what we want. But we can’t change it to AutoAccept because it’s not a resource!

Okay, well, New-Mailbox uses the “-Room” parameter, so all we need to do is to use Set-Mailbox with that parameter, right?